Understand your
body better.
Evidence-based guides on fitness, nutrition, and understanding health metrics.
✦ AI-powered — understands natural language
The Relative Age Effect: Why Birth Month Shapes School and Sport
Carbohydrates and Sports Performance: Glycogen, Carbo-Loading, and the Marathon Wall
Glycogen powers high-intensity exercise and runs out after 90–120 minutes — which is exactly why marathoners hit the wall. Here's the science of carbo-loading, carbohydrate intake during endurance events, the post-exercise glycogen window, and where low-carb approaches fit in sports nutrition.
Hydration and Electrolytes: When Plain Water Isn't Enough During Exercise
Multiple Ironman athletes were hospitalised from drinking too much plain water — exercise-associated hyponatraemia. Here's how electrolytes regulate fluid balance, when plain water is insufficient during prolonged exercise, sodium replacement guidelines, and the "drink to thirst" vs. scheduled drinking debate.
Ultra-Processed Food and Calorie Intake: Why the NIH Study Changed the Conversation
A controlled NIH experiment showed people spontaneously ate 508 more calories per day on ultra-processed food vs. whole food — with identical macros. Here's why ultra-processed food drives overconsumption, what the satiety index reveals, and how food quality affects whether a calorie target feels effortless or exhausting.
The Ideal Weight Formulas Were Designed for Drug Dosing — Not Your Health Goals
The ideal body weight formulas in most calculators were developed in the 1960s–70s for drug dosing — not for health or fitness goals. Here's what they actually measure, why they disagree, and what a more useful framework looks like.
Fertility Awareness Methods: How the Symptothermal Method Differs from the Calendar Method
The calendar method fails 14–47% of the time. The symptothermal method, properly taught, achieves 0.4–2% failure with perfect use — comparable to hormonal methods. Here's how modern fertility awareness works, how Natural Cycles got FDA clearance, and the contraceptive effectiveness hierarchy.
Your Menstrual Cycle Is a Vital Sign — Here's What Irregular Periods Signal
The menstrual cycle is a vital sign — not just a calendar event. Here's what cycle length, irregularity, and symptoms reveal about stress, thyroid health, PCOS, and nutrition status, and how to track more than just the next period date.
How Due Dates Are Calculated — And Why Most Babies Don't Arrive on Them
Only 4–5% of babies are born on their due date. Here's how the 40-week calculation works, why it's imprecise, what "term" actually means, and the real distribution of when babies arrive.
Body Fat Percentage Ranges: What the Numbers Mean and Why Fat Location Matters
Body fat percentage reveals what weight alone can't — but the ranges need context. Here's what different percentages actually mean, why visceral fat carries more risk than subcutaneous fat, and which measurement methods are accurate.
Muscle, Metabolism, and Sarcopenia: Why Building Muscle Is the Best Long-Term Metabolic Investment
Muscle tissue burns roughly 3× more calories per kg at rest than fat. Sarcopenia causes 1–3% muscle loss per year from age 35 onward, gradually lowering BMR. Here's the case for resistance training as a long-term metabolic investment and the protein requirements to support it.
How Much Protein Do You Actually Need? The Evidence-Based Answer
Protein is the macro where most people fall short of the evidence-backed optimal amount. Here's how much you actually need, why leucine triggers muscle protein synthesis, and which foods deliver protein most efficiently per calorie.
Childhood BMI: How Percentiles Work and Why Adult Thresholds Don't Apply to Children
Children's BMI uses percentiles relative to age and sex, not the adult 25/30 thresholds. Here's how paediatric BMI assessment works, why it's sex-specific, global childhood obesity statistics, and why a single BMI reading for a child requires growth trajectory context.
How Life Expectancy Doubled in 200 Years — and What Longevity Research Actually Shows
Life expectancy has doubled since 1800 — mostly by reducing childhood death, not by people living longer in old age. Here's why historical lifespans weren't as short as averages suggest, what Blue Zones research shows, and the growing gap between total life expectancy and healthy life expectancy.
